Amentioned before I thought I saw one or other of you recommending Mobil 1 for the gearbox. However, looking at the GL-4 (Mil-L-2105)requirement in the Audi manual, and the Mobil Product Data Sheet at http://www.mobil.com/consumer/mobil1/lubrpds_content.html, which says that it should NOT be used in transmissions requiring GL-4 performance, I am now rather circumspect. Any new data? John C.